Pipes and Cistern - Important Formulas

1. Inlet:
   A pipe connected with a tank or a cistern or a reservoir, that fills it, is known as an inlet.
   Outlet:
   A pipe connected with a tank or cistern or reservoir, emptying it, is known as an outlet.
   
   
2. If a pipe can fill a tank in x hours, then:
   
   

   part filled in 1 hour =	1	.
   	x

   
   
3. If a pipe can empty a tank in y hours, then:
   
   

   part emptied in 1 hour =	1	.
   	y

   
   
4. If a pipe can fill a tank in x hours and another pipe can empty the full tank in yhours (where y > x), then on opening both the pipes, then

   the net part filled in 1 hour =		1	-	1		.
   		x		y

   
   
5. If a pipe can fill a tank in x hours and another pipe can empty the full tank in yhours (where y > x), then on opening both the pipes, then

   the net part emptied in 1 hour =		1	-	1		.
   		y		x

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Posted in: Aptitude